US 12,236,815 B2
Illumination device and method for turning on or turning off a first and/or a second laser diode of an illumination device
Christian Adam Grafenburg, Stuttgart (DE); and Moritz Esslinger, Leonberg (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Nov. 13, 2023, as Appl. No. 18/508,126.
Claims priority of application No. 10 2023 200 658.8 (DE), filed on Jan. 27, 2023.
Prior Publication US 2024/0257677 A1, Aug. 1, 2024
Int. Cl. G09G 3/00 (2006.01); G02B 27/01 (2006.01)
CPC G09G 3/003 (2013.01) [G02B 27/0172 (2013.01); G02B 2027/0112 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0178 (2013.01); G09G 2320/0666 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An illumination device, comprising:
a first laser diode configured to emit a first light beam within a first wavelength range, the first wavelength range changing depending on a temperature of at least one first laser cavity of the first laser diode;
a second laser diode configured to emit a second light beam within a second wavelength range, the second wavelength range changing depending on a temperature of at least one second laser cavity of the second laser diode;
a first sensor configured to acquire at least one piece of information concerning a current first wavelength range of the emitted first light beam; and
a control unit configured to determine the current first wavelength range depending on the information acquired by the first sensor concerning the current first wavelength range, wherein the control unit is configured to turn on the first laser diode at a first point in time, and to turn off the first laser diode at a second point in time following the first point in time, depending on a comparison of a first wavelength value of the determined current first wavelength range with a first wavelength threshold value, and to turn on or leave on the second laser diode, wherein the control unit is configured to select the first wavelength threshold value such that the first light beam emitted by the first laser diode or the second light beam emitted by the second laser diode always lies within a third, constant wavelength range.